Swab cup



Dec. 15,1925.

c. s. CRICKMER SWAB CUP Filed Feb, 28, 1925 Patented Dec. 15, 1925.

UNITED STATES 1,565,797 PATENT OFFICE.

CHARLES S. CRIOKMER, 0F DALLAS, TEXAS, ASSIGNOR TO THE GUIBERSON CORPORA- TION, OF DALLAS, TEXAS, A CORPORATION OF DELAWARE.

SWAB CUP.

Application filed February 28, 1925. Serial No. 12,268.

To aZZ whom it may concern:

Be it known that 1. CHARLES S. CRICK- a-uzn, a citizen of the United States of America, residing at Dallas, in the county of Dallas and State of Texas, have invented certain new and useful Improvements in Swab Cups, of which the following is a specification.

This invention relates to new and useful improvements in swab cups.

The invention has to do with the flexible cups used on pump swabs for oil Wells and the like, such cups also being inverted and used as packers.

The object of the invention is to provide a flexible cup having a reinforcing bushing for attaching the cup to its support.

A particular object of the invention is to provide means for preventing stripping of the cup from the mandrel and to obviate splitting and breaking of the cup at its point of attachment to the mandrel.

A construction designed to carry out the invention will be hereinafter described together with other features of the invention.

The invention will be more readily understood from a reading of the following speciiication and by reference to the accompanying drawings, in which an example of the invention is shown, and wherein:

Fig. 1 is a vertical sectional View of a cup constructed in accordance with my invention,

' Fig. 2 is a plan view of the cup, and

Fig. 3 is a cross-sectional View taken on the line 33 of Fig. 1.

In the drawings the numeral 10 designates a flexible cup composed of rubber, rubber compound or any other suitable material. The cup illustrated is of the mushroom type is particularly adapted to be used with the reinforcing cage and mandrel, such as is shown in Letters Patent No. 1,527 ,956, but'its use is not limited thereto and the invention may be applied to any style of cup where its use is found advantageous.

The cup has an annular lip 11 at its upper .end and is formed with a central bore or well 12. v The lower portion of the cup is tapered at 13 so as to offer less resistance to a down stroke of the cup. In the outer surface of the cup are provided spaced vertical grooves 14 terminating short of the bottom out the invention I provide a metal bushing 16 having a cylindrical bore 17 of less diameter than the bore 12 of the cup.

The bushing is molded in the cup and has a pair of spaced circumferential ribs 18 and between these ribs is recessed at 19 so as to provide sufficient thickness of the cup between the bushing and the ends of the pockets 15. The bushing terminates flush with the bottom of the cup, but this is not essential. The ribs seating in the wall of the cup prevent longitudinal displacement of the bushing. The bushing is long enough to properly support the cup. The bore 17 being less than the bore 12 permits the use of a mandrel or other support of less diameter than the bore 12 of the cup, whereby the cup may be compressed or expanded and its upper portion is free to flex.

Various changes in the size and-shape of the diflerent parts, as well as modifications and alterations may be made within the scope of the appended claims.

\Vhat I claim, is:

1. A swab cup comprising a flexible cup body provided with an axial opening having a seat, and a metallic reinforcing bushing engaged in the seat of the opening of the body and held against longitudinal displacement therein.

2. A swab cup comprising a flexible cup body having an axial opening, and a metallic reinforcing bushing inserted in the lower end of the opening and having circumferential projections engaging in the walls of the opening of the body and holding said bushing against longitudinal displacement therein.

3. A swab cup comprising a flexible cup body, and a reinforcing bushing molded in the base of the cup.

4. A swab cup comprising a flexible cup body, and a reinforcing bushing embedded in the base of the cup against longitudinal bore, and a reinforcing bushing embedded in displacement. n the bore of the cup at the base of the cup. 10 5. A swab cup compiisin a flexible cup v7. A bushing for a swab cup comprising body, and a reinforcing ushing having a cylindrical body having circumferential 5 horizontally extendi projections e'mribs spaced apart.

bedded in the base of tie cup. In testimony'whereof I alfix my signature.

6. A swab cup comprising a flexible cup body having a reduced base and acentral CHARLES S. CRICKMER. 

